Can you add unknowns that have coefficients and exponents?
the unknowns must be the same variable and the exponents have to
be the same.
examples)
x4 + y4 cannot be added because they are not the same
variable.
x3 + x2 cannot be added because they have different
exponents.
3y6 + 5y6 can be added because they have the same variable and
exponents.
(answer: 8y6)